// sqrt.cpp -- 使用 sqrt() 函数
#include <iostream>
#include <cmath> // 或 math.h

int main()
{
    using namespace std;
    double area;
    cout << "Enter the floor area, in square feet, of your home:";
    cin >> area;
    double side;
    side = sqrt(area);
    cout << "Thas's the equivalent of a square " << side
         << " feet to the side." << endl;
    cout << "How fasination!" << endl;
    return 0;
}
